[R-sig-Geo] listw for local Moran in spdep

[Roger Bivand]

On Mon, 7 Feb 2011, Agustin Lobo wrote:

> Hi!
>
> I'd like to run localmoran() from spdep on a small grid (matrix). Is
> there a function to calculate the spatial weights (listw) from
> the grid  (defining 3x3 neighborhoods)?

For a 3x3 neighbourhood on a grid simply defined by numbers of rows and 
columnd, see ?cell2nb. Otherwise, use dnearneigh() with the threshold set 
to the length of the diagonal distance between cell centres giving the 
cell centre coordinates as input.

>
> (BTW: the definition of LISA in the spdep manual is unformatted)
>

The LaTeX version looks fine! I'll try to repair the regular page.

Roger

> Thanks
>
> Agus
>
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no